Many-Body Interaction Evidenced through Exciton-Trion-Electron Correlated Dynamics

• Authors: M. Portella-Oberli , J. Berney , B. Deveaud , V. Ciulin , M. Kutrowski , T. Wojtowicz
• Languages of publication: EN

Abstracts

EN

Interactions among excitons, trions, and electrons are studied in CdTe modulation-doped quantum wells. These many-body interactions are investigated through the nonlinear dynamical properties in the excitonic complexes using time and spectrally resolved pump and probe techniques. This study is performed as a function of temperature and densities of excitons, trions, and electrons. The results reveal that the nonlinearities induced by trions differ from those induced by excitons and moreover they are mutually correlated. The correlated behavior of excitons and trions manifests itself by crossed trion-exciton effects. We propose that the main source of these correlations is due to the presence of electrons in the quantum well and that its physical origin is the Pauli exclusion-principle. We find that, at 5 K, trions are formed from excitons within 10 ps; at 20 K a thermal equilibrium is reached within 5 ps.

Keywords

EN

71.35.Pq; 78.47.+p; 42.65.-k; 78.67.De

Discipline

• 78.67.De: Quantum wells
• 71.35.Pq: Charged excitons (trions)
• 42.65.-k: Nonlinear optics

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2004
• Volume: 106
• Issue: 3
• Pages: 423-434

Dates

published

2004-09

received

2004-06-10

Contributors

author

M. Portella-Oberli

• Institut de Photonique et d'Electronique Quantique, Ecole Polytechnique Fèdèrale de Lausanne (EPFL), 1015 Lausanne, Switzerland

author

J. Berney

• Institut de Photonique et d'Electronique Quantique, Ecole Polytechnique Fèdèrale de Lausanne (EPFL), 1015 Lausanne, Switzerland

author

B. Deveaud

• Institut de Photonique et d'Electronique Quantique, Ecole Polytechnique Fèdèrale de Lausanne (EPFL), 1015 Lausanne, Switzerland

author

V. Ciulin

• IQUEST, University of California, Santa Barbara, Ca 93106, USA

author

M. Kutrowski

• Institute of Physics, Polish Academy of Science, al. Lotnikow 32/46, 02-668 Warsaw, Poland

author

T. Wojtowicz

• Institute of Physics, Polish Academy of Science, al. Lotnikow 32/46, 02-668 Warsaw, Poland

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Identifiers

DOI

10.12693/APhysPolA.106.423